Answer:
option (B).
Explanation:
it's really simple....
just replace the (n) near the 3 with 1,2,3,4,5 and 6 and then solve the maths and when you're done , you add the answers all up.
sooo...
3(1)-2 = 1
3(2)-2 = 4
3(3)-2 = 7
3(4)-2 = 10
3(5)-2 = 13
3(6)-2 = 16
now we add them all up...
1+4+7+10+13+16 = 51.
Hope this helps.
Good luck.